Low incidence rate; high fatality rate
As requested, here is a link to research that backs the claim that lower incident rates are correlated to higher fatality rates.
This is one of several that are out there. I have been receiving requests lately to provide some sources to support the claim and I want to share this link to fulfill those requests. As I come across others I will be sure to share those as well. I hope you find it informative and helpful as we move forward together and improve our knowledge and understanding of safety!